71M6541DSLASHFSLASHG datasheet(159/166 Pages) MAXIM

159 / 166 page

71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

159

6.9

Pin Descriptions

6.9.1

Power and Ground Pins

Pin types: P = Power, O = Output, I = Input, I/O = Input/Output.

The circuit number denotes the equivalent circuit, as specified under 6.9.4 I/O Equivalent Circuits.

Table 119: Power and Ground Pins

(64 pin)

(100-pin)

Name

Type

Circuit

Description

72, 80

GNDA

–

Analog ground: This pin should be connected directly to

the ground plane.

GNDD

–

Digital ground: This pin should be connected directly to

the ground plane.

V3P3A

–

Analog power supply: A 3.3 V power supply should be

connected to this pin. V3P3A must be the same

voltage as V3P3SYS.

V3P3SYS

–

System 3.3 V supply. This pin should be connected to a

3.3 V power supply.

V3P3D

Auxiliary voltage output of the chip. In mission mode,

this pin is connected to V3P3SYS by the internal

selection switch. In BRN mode, it is internally

connected to VBAT. V3P3D is floating in LCD and

sleep mode. A 0.1 µF bypass capacitor to ground

must be connected to this pin.

VDD

–

The output of the 2.5V regulator. This pin is powered

in MSN and BRN modes. A 0.1 µF bypass capacitor to

ground should be connected to this pin.

VLCD

–

The output of the LCD DAC. A 0.1 µF bypass

capacitor to ground should be connected to this pin.

VBAT

Battery backup pin to support the battery modes (BRN,

LCD). A battery or super-capacitor is to be connected

between VBAT and GNDD. If no battery is used,

connect VBAT to V3P3SYS.

VBAT_RTC

RTC and oscillator power supply. A battery or super-

capacitor is to be connected between VBAT and

GNDD. If no battery is used, connect VBAT_RTC to

V3P3SYS.

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